But both departures leave us feeling like Facebook is having trouble holding onto the talent it needs to become a hypergrowth story once again.

Beard, a former Google executive, stabilized Facebook's platform efforts after a period of political infighting and management confusion in 2008. The platform, which third-party developers use to connect their software to Facebook's social network, is now a key part of Facebook's ubiquity and still offers the company a lot of potential for new business opportunities.